Systems and methods for servicing memory access requests

1 . A device comprising:

a controller;

a first non-volatile memory (NVM) device;

a second NVM device;

a cache memory; and

a buffer memory configured to store at least a portion of data stored in the first NVM device,

wherein the controller is configured to:

detect a first condition, wherein the first condition includes a threshold fullness of the buffer memory;

set, based on the first condition, the first NVM device for operating in a write operation mode and the second NVM device for operating in a read operation mode;

receive a write request from a computing device for writing data into a memory address;

select the first NVM device based on the first NVM device being set in the write operation mode;

store the data in the first NVM device and in the buffer memory based on the write request;

receive a read request from a computing device for the data;

determine presence of the data in the cache memory, and generate a result;

based on the result, generate a read command for the data; and

based on the read command:

determine that the data is stored in the buffer memory; and

retrieve the data from the buffer memory into the cache memory.

2 . The device of claim 1 , wherein the first condition includes at least one of expiration of a time period, loss of power, or a command from the computing device.

3 . The device of claim 1 , wherein the controller is further configured to:

detect a second condition;

store second data in the buffer memory to the second NVM device; and

set the first NVM device to the read operation mode and the second NVM device to the write operation mode.

4 . The device of claim 1 , wherein the controller is further configured to:

detect a second condition;

based on detecting the second condition, the controller is further configured to:

set the first NVM device and the second NVM device to operate in the first write operation mode.

5 . The device of claim 4 , wherein the second condition includes loss of power to the device, wherein the controller is further configured to:

read first data and second data stored in the cache memory device; and

store the first data into the first NVM device and the second data into the second NVM device.

6 . The device of claim 4 , wherein the second condition includes detecting power to the device, wherein the controller is further configured to:

identify first data in the first NVM device and second data in the second NVM device;

read the first data and the second data from respectively the first NVM device and the second NVM device; and

store the first data and the second data in the cache memory.

7 . The device of claim 1 , wherein the controller being configured to set the first NVM device for operating in a first operation mode and the second NVM device for operating in a second operation mode further includes the controller being configured to:

set in a memory a first value for the first NVM device for identifying the first operation mode, and a second value for the second NVM device for identifying the second operation mode.

8 . A method comprising:

detecting, by a controller of a storage device, a first condition, wherein the first condition includes a threshold fullness of a buffer memory storing at least a portion of data stored in a first non-volatile memory (NVM) device;

setting, by the controller, based on the first condition, the first NVM device for operating in a first operation mode and a second NVM device for operating in a read operation mode;

receiving, by the controller, a write request from a computing device for writing data into a memory address;

selecting, by the controller, the first NVM device based on the first NVM device being set in the write operation mode;

storing, by the controller, the data in the first NVM device and in the buffer memory based on the write request;

receiving, by the controller, a read request from a computing device for the data;

determining, by the controller, presence of the data in a cache memory, and generating a result;

based on the result, generating a read command for the data; and

based on the read command:

determining that the data is stored in the buffer memory; and

retrieving the data from the buffer memory into the cache memory.

9 . The method of claim 8 , wherein the first condition includes at least one of expiration of a time period, loss of power, or a command from the computing device.

10 . The method of claim 8 further comprising:

detecting, by the controller, a second condition;

storing, by the controller, second data in the buffer memory to the second NVM device; and

setting the first NVM device to the read operation mode and the second NVM device to the write operation mode.

11 . The method of claim 8 further comprising:

detecting a second condition;

based on detecting the second condition:

setting, by the controller, the first NVM device and the second NVM device to operate in the write operation mode.

12 . The method of claim 11 , wherein the second condition includes loss of power to the device, wherein the method further comprises:

reading first data and second data stored in the cache memory device; and

storing the first data into the first NVM device and the second data into the second NVM device.

13 . The method of claim 11 , wherein the second condition includes detecting power to the device, wherein the method further comprises:

identifying first data in the first NVM device and second data in the second NVM device;

reading the first data and the second data from respectively the first NVM device and the second NVM device; and

storing the first data and the second data in the cache memory.

14 . The method of claim 8 , wherein the setting of the first NVM device for operating in a first operation mode and the setting of the second NVM device for operating in a second operation mode further includes:

setting in a memory a first value for the first NVM device for identifying the first operation mode, and a second value for the second NVM device for identifying the second operation mode.